Exchange 2010 SP2 Update-Rollup 4 Re-released

Earlier this week Microsoft has rereleased some updates for both Exchange Server 2010 and 2007 because of some problems with the code signing certificates:

Microsoft is aware of an issue involving specific digital certificates that were generated by Microsoft without proper timestamp attributes. These digital certificates were later used to sign some Microsoft core components and software binaries. This could cause compatibility issues between affected binaries and Microsoft Windows. While this is not a security issue, because the digital signature on files produced and signed by Microsoft will expire prematurely, this issue could adversely impact the ability to properly install and uninstall affected Microsoft components and security updates.

If you have deployed RU4-v1 is worth noting that while you’re protected from the security vulnerabilities addressed in them, you might run into problems with future updates:

Note regarding the impact of not installing a rereleased updateCustomers who installed the original updates are protected from the vulnerabilities addressed by the updates. However, because improperly signed files, such as executable images, would not be considered correctly signed after the expiration of the CodeSign certificate used in the signing process of the original updates, Microsoft Update may not install some security updates after the expiration date. Other effects include, for example, that an application installer may display an error message. Third-party application whitelisting solutions may also be impacted. Installing the rereleased updates remediates the issue for the affected updates.